Individual telephone-call



2 Sheets-Sheet 1-;

No Model.

J. H. GARY.

INDIVIDUAL TELEPHONE CALL.

. Patented July 17, 1883-. .Fyl. 11- 1. E a 5 6 fivuentor Wv PETERS.PMlo-Lillwgraphor. Walhinglou. (1 C.

' 2Sheets-Sheet 2.

(No Model.) J. H. GARY. l V INDIVIDUAL TELEPHONE CALL.

Nu 281,614. I fP-at e-nte'd Jul -17,1883.

LINE

74 61777266686; I I I 2o at the central station a magneto or dynamo 7UNITED STATES PATENT OFFICE.

JAMES H. GARY, or BOSTON, ASSIGNOR To HORACE P. TOBEY, or WAREHAM,MASSACHUSETTS.

INDIVIDUAL TELEPHONE-CALL.

SPECIFICATION forming part of Letters Patent No. 281,614, dated July1'7, 1883. Application filed October 23,1882. No model.)

to telephone systems, where a number of substations are located on oneline radiating from a central operating-station.

My invention has for its object to provide a.

new and simple system of calling any particular sub-station withoutsignaling any other sub-station on the line; and it consists in theemployment of magneto-currents varying in direction or polarity, wherebythe different parts of mechanism at the substations are operated toeffect the desired results. I employ machine whichmay be operated withkeys, that the depression of one key sendsa current or pulsation of onepolarity to line to cause the dials or pointers of all the instrumentsat theseveral sub-stations to rotate one number or step until the numberwanted is reached,

and thenby continuously depressing another key or keys an intermittentcurrent or a current composed of reversals of polarity will be sent toline and ring a bell, after which a current of opposite polarity to thefirst used is. sent to line by depressing a third key for the purpose ofsetting all of the instruments at unison.

In carrying out my invention, suppose that the individual signalmechanism shown and described in Letters Patent 01" the United centralstation.

at the several sub-stations to unison, the currents causing thepolarized armatures to move in the proper direction to arrest thepins'upon their shafts, and so unison and lock them. Currents orpulsations of opposite polarity being now sent to line, the polarizedarmatures are attracted to the opposite pole of the electromagnet,permitting the several shafts to rotate to the number of pulsations sentto line. When the circuit-breaker at the required station has operatedto break the line and open the circuit through the bell to ground, currents of alternating or of rapidlyreversed polarity are sent from thecentral station to cause the bell to ring.

I may employ any bell I choose at the substation. Ordinarily I prefercrank magnetobells, by which a sub-station can signal the The generatorat the central station, used for the purpose of signaling, may also beused in all the operations of said station requiring electric energy,all of which I will now proceed to specifically describe and claim.

In Figure 1 of the accompanying drawings I s have represented thevarious circuits and keys required in a central station, and a metalliccircuit connected to said station, having in its circuit sixsub-stations. Figs. 2 and 3 are dia grams to show the circuits throughan individual circuit-controlling apparatus.

In Fig. 1, Bis a magneto-generator of the Siemens armature type, itsarmature A arranged to be rotated by the pulley 10 upon one end thereof.Upon its opposite end is the commutator h; against the opposite sides ofwhich press the springs z and 2. Bearing against the ends'of thearmature are springs g g.

A is a board, on the upper side of which are the binding-posts 1, 2, 3,and 4. Post 1 is connected by wire (1 to commutator-spring j and post 4to the other spring, z.

(rand a are strap-keys connected to posts 2 and 3, respectively. Theanvil of key a is connected to post I, and the anvil of key a also withpost 1, by a wire, In. G is another board, having at its upper end thebinding-posts 5, 6, 7, and 8. t and u are strap-keys connected togetherat their free ends by the block 0, of insulating material. Said keysnormally rest against their back contacts, 0 1). Connection is made fromarmature-spring g by wire f, resistance It, to post 5 by wire k, toanvil 1', and

.from spring 1, by wire f, to post 6, wire a, to

anvil s. From post 2 connection is made by wire I) to post '7, wire Z toback contact 0, and from post 3, by wire a, to post 8, wirem, to backcontact 1). From the key 15 the line wire D runs to the sub-stations 1,2, 3, 4, 5, and 6, and back again, by wire E, to key a.

It is understood when a metallic circuit is not used the line-wire willbe grounded at the lust sub-station, and also from key a. In the normalcondition of the apparatus, as shown in the drawings, no current goes toline. To send a negative current to line, the key a is pressed to makecontact with the anvil I), the circuit being from commutator-spring j,wire (1 d, anvil 1), key (1, wires 1) and I, back contact 0, key 15, toline D. To send a positive pulsation, the key a is depressed, when thecircuit will be from commutatonspring 2 wires 0 and 0, back contact as,key a, wires 1) and 1, back contact 0, key t, to line D, and back, bywire E, to key 11, wires on and c, to key a, anvil 0, wires 7; and d andd, commutator-spring j. To send an alternating current, the keys t and uare simultaneously pressed to their anvils, the circuit in this casebeing from spring 1, wire f, resistance It, wires f and k, anvil 2', key1, line D and E, key a, anvil 8, wires n and f, to spring 9. XVhen notusing a metallic circuit, the circuit would of course be grounded at keya.

I do not confine the use of this system to the special form of mechanismin my Letters Patent referred to, as I may apply it to any de vicesnecessitating the operations specified.

The oilice of the resistance is to weaken the pulsations going to lineto such an extent as not to disturb the armatures of the sub-stationinstruments intervening between the central station and the sub stationto be signaled. The rapid reversals employed will also tend to keep saidarmatures from moving, as there is not suificient time between saidreversals for the said armatures to become magnetized and demagnetized.

In Fig. 2, I have shown the connection of the parts of thecircuit-controlling apparatus de scribed in my above-named LettersPatent and pending application to illustrate the operation ofbringingthe said apparatus to a unison-point. \Vhen a current of a givenpolarity-say positiveis sent to line to bring the instruments to unison,the polarized armature P is attracted to the pole M, as shown in fulllines, causing the bent arm thereof to swing across the path of the studR in the shaft 0. XVhen continuous pulsations are sent to line and causethe shaft 0 to rotate by means of a step-by-step movement, as shown anddescribed in said Letters Patent and application, the stud R strikesagainst the curved end of armature I. This result takes place in all ofthe apparatus'at the several sub-stations,cansing them to come tounison. When all the instruments are at unison, a current of opposite ornega tive polarity is sent to line, which releases the armature P andcauses it to be attracted to the opposite pole of the electro-magnet Mand make a free path for the stud It. Now, the requisite number ofnegative pulsations are sent toline to rotate the shaft 0 to break thecircuit at the desired sub-station. I

In Fig. 3 are shown the parts of the controlling apparatus necessary tobreak the circuit at a sub-station. The shaft 0 being caused to rotateas described, the circuit-breaker 0 depresses the spring a from itselectrical connection with spring m, diverting the path of the electriccurrent from line out to wire 3, spring j, which rests upon shaft 6, tospring 1, bell B, (which is caused to ring, and line out or ground. Tocause the bell B to ring it is necessary to use short quick pulsationsof both polarities rapidly reversed, in order that the parts brought tothe desired portions by continuous currents of opposite polarity may notbe disturbed, and thus defeat the desired result. This is done while theparts of the sub-station to be signaled are in position shown in Fig. 3,in the manner previously described.

I claim-- 1. The combination, substantially as hereinbefore described,in a system of individual electrical signaling, of a main-line circuit,two or more signaling-instruments adapted to respond to electricpulsations of rapidly-alternating direction included therein, a shunt orbranch circuit round each of the said signaling-instruments, and anelectro mechanical circuitchanger in the main circuit, adapted to breakthe said shunt and introduce the signal-bell into the main circuit afterthe transmission of a definite number of electrical impulses, withtransmitting devices at a central station, consisting of a magneto ordynamo electric generator, suitable connections from the commutatorthereof to keys, whereby currents of constant direction, reversible atwill, may be transmitted to line, and other connections from the generator,indcpendent of the commutator, to other keys, whereby rapidlyalternating currents may be transmitted to line, for the purposesspecified.

2. The combination, in a system of electrical signaling, of amagneto-electric or dynamoelectric generator provided with a commutator,a main-line signaling-circuit with two or more sub-stations locatedthereon, and suitable eontrolling-keys placed between the said generatorand the said main line, two of which are connected with the commutatorand the remaining two with the generator, independent of the saidcommutator, whereby when one of the commutator-keys is operated currentsof a definite and constant direction are sent to line, and when theother commutator-key is operated constant currents of opposite directionare sent to line, and whereby when the IIO two independent keys aredepressed the commutator is cut out and currents of rapidlyalternatingdirection are sent to line, substantially as described.

3. The combination, in an electric signalingcircuit, substantially ashereinbefore described, of a series of electric bells adapted to respondto rapidlyalternating currents, each of the said bells normally shuntedfrom the main circuit by short-circuiting springs, and a series ofelectro-mechanical circuit-changers or shunt breakers, (one for eachbell,) each consisting of an electro-magnet with neutral and polarizedarm'atures, the former actuating a ratchetwheel shaft and cam, to openthe short circuit round the signal-bell and introduce the same into theline-circuit after a predetermined number of electric impulses ofdefinite direction, and the latter adapted, aftera single impulse ofopposite direction, to swing into the path of the unison-pin on theratchet-shaft and form a stop or zero, at which all the instruments maybe brought to unison, with a magnetogenerator provided with acommutator, a key connected between one side of the said commutator andthe main line, and adapted to send constant currents of given directionto hold the polarized armatures of the circuitchangers in position tolock the ratchet-shafts, a second key connected between the other sideof the commutator and the line, and adapted to send constant currents ofopposite direction to sive impulses, differing in number for each bell,to open the shunt-circuits of the receivers and introduce the said bellsinto the main circuit, and a third and double key connected between thegenerator and the main line independent of the commutator, and adaptedto send rapidly-alternating currents to line, whereby the bells,whenbrought into the main-line circuit, may be rung.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, this 19th day of October, A. D.1882.

, JAMES H. CARY.

Witnesses:

Gno. H. CARY, A. L. WHITE.

unlock the said ratchetshafts, and by succes

